Reclaim full control over your Time Machine exclusions list.
The seemingly unsolvable problem of TM taking hours to save god-knows-what-file finally resolved !
wget https://raw.githubusercontent.com/Kraymer/deus_ex_tmachina/master/deus_ex_tmachina.sh
./deus_ex_tmachina.sh
You'll be presented the folders located in your root and home directories. Comment/remove the few folders names you want to backup and save the file. Execute the generated shell script. BAM! you're done.
